Simple, rapid, and visual electrochemiluminescence sensor for on-site catechol analysis

Abstract

A simple, rapid and visual mesoporous silica (MSNs)-electrochemiluminescence (ECL) sensor was developed for on-site monitoring of Cat.

Composite Silica‐Based Films as Platforms for Electrochemical Sensors

“…They will be noted as vertically‐oriented mesoporous silica film (VMSF) hereafter. Several kinds of composite films can be distinguished: (1) those made of the mesoporous silica film filled with the organic template used for its synthesis (mainly surfactants [25–27,33,137] but also coordination polymers [183] ), mainly deposited on flat electrode surfaces as indium‐tin oxide (ITO) [163,164,173,175,177,178] or electrodeposited as nanocomposite films around reduced graphene oxide; [125] (2) those made of surfactant‐extracted mesoporous silica electrodeposited as nanocomposite films around various kinds of nanocarbons (reduced graphene oxide, three‐dimensional graphene, carbon nanotubes or graphene‐carbon nanotube assemblies); [121,123–−125,128,130,138,140,146,149,153,155,156] (3) a wide range of chemically modified mesoporous silica films that can be basically divided further in two categories depending on whether they contain organo‐functional groups (either weakly immobilized [126,129,139,145,162,165,166,169,171,172,176,179,180] or strongly attached via covalent bonds [116,118–−120,122,126,127,131,133,134,136,137,143,147,150−152,157,160,161,174] ) or serve as hosts for nano‐objects (such as polymers [140,141,158] or nanoparticles [159,167,168,170,181,182] ); and (4) other composites made of ordered silica films combined with other nanomaterials (such as clays, [117,132,135] for instance). An illustrative summary of the various sensing applications of composite electrodes made of VMSF materials, respectively with filled pores, open pores and functionalized pores, is given in Figure 4.…”

“…Such porous matrices contribute to improving the stability of luminophores and coreactants immobilised in the film and facilitate the mass transport of electroactive species through the film, increasing the probability of contact between the analytes in solution and the active sites of the support, thus enhancing dramatically the sensitivity of the electrochemical sensors (see examples in Tables 1–3). [129,145,162,165,169–−172,179,180,235–242] ECL can be also used as a readout signal for the biosensors, providing a high sensitive and selective method of detection of substrates in enzymatic electrochemical biosensors as well as immuno‐ and aptasensors (see examples in Tables 3&4) [126,127,151,161,222,243–247] . They are mostly based on the two commonly used luminophores luminol and Ru(bpy) 3 2+ , this latter offering the advantage to be regenerable unlike luminol which is consumed.…”

Determination of catechol in tea based on the inhibition of CS@Cd composites electrochemiluminescence

“…Meanwhile, as a typical phenolic compound, it is an important intermediate or raw material in the elds of medicine, food, coatings, resins and fragrance industry (Liang, Zhang, Zhang,et al, 2022;Zhou, Shan, Jiang, et al, 2020). However, CA has posed a serious threat to ecological environment and human health due to its degradation-resistant and cytotoxicity (Chen, Lei, Xu, Yang, Dong, Li, et al, 2022). Therefore, simple, quick and accurate detection of CA is of great signi cance.…”

Framework-Enhanced Electrochemiluminescence in Biosensing

“…Benefitting from its unique light-free luminescence mechanism, ECL has many advantages for an analysis, such as a high sensitivity, good stability, and low background [3]. Nowadays, ECL is widely applied in the areas of environmental monitoring [4], cell sensing [5], imaging [6], food [7], and water safety [8]. ECL-driven tumor photodynamic therapy (PDT) was proposed through the effective energy transfer from ECL emission to photosensitizer chlorin e6 [9].…”